VOA慢速英语:美国著名土拨鼠每年都做冬季预报

shadow – n. a dark shape that appears on a surface when someone or something moves between the surface and a source of light

monotony – n. a situation in which something stays the same and is therefore boring

cycle – n. a group of events that happen in a particular order and are often repeated

over the horizon – phr v. about to happen

virtually – adv. using computer and internet technology to conduct activities normally carried out in person

cast – v. to send light or a shadow in a particular direction